The highest day temperature in September 2026 was 68°F. The lowest night temperature was 28°F. The average values for day and night temperatures during September were 50.0°F и 43.7°F respectivly.

The average sea surface temperature in September 2026 for Yellowknife was 52.4°F. The maximum and minimum values were 48.0°F and 57.6°F respectively.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Yellowknife is 0.3 in. This value is relatively stable throughout the year.

The average wind speed in September is 9.8 mph. It makes September one of the most windy months of the year for Yellowknife.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Yellowknife in September is 6.1 hours.